    .box{ 
        	font-size: 20px; 
        	color:#4cc134; 
        	margin: 10px;
        	animation: changeshadow 1s  ease-in  infinite ;
        	/* 其它浏览器兼容性前缀 */
    	    -webkit-animation: changeshadow 1s linear infinite;
    	    -moz-animation: changeshadow 1s linear infinite;
    	    -ms-animation: changeshadow 1s linear infinite;
    	    -o-animation: changeshadow 1s linear infinite;
        }  
        @keyframes changeshadow {  
            0%{ text-shadow: 0 0 4px #4cc134}  
            50%{ text-shadow: 0 0 40px #4cc134}  
            100%{ text-shadow: 0 0 4px #4cc134}  
        }
        /* 添加兼容性前缀 */
    	@-webkit-keyframes changeshadow {
    	  0%{ text-shadow: 0 0 4px #4cc134}  
              50%{ text-shadow: 0 0 40px #4cc134}  
              100%{ text-shadow: 0 0 4px #4cc134}  
    	}
    	@-moz-keyframes changeshadow {
    	    0%{ text-shadow: 0 0 4px #4cc134}  
                50%{ text-shadow: 0 0 40px #4cc134}  
                100%{ text-shadow: 0 0 4px #4cc134}  
    	}
    /*	@-ms-keyframes changeshadow {
    	    0%{ text-shadow: 0 0 4px #4cc134}  
                50%{ text-shadow: 0 0 40px #4cc134}  
                100%{ text-shadow: 0 0 4px #4cc134}  
    	}
    	@-o-keyframes changeshadow {
    	    0%{ text-shadow: 0 0 4px #4cc134}  
                50%{ text-shadow: 0 0 40px #4cc134}  
                100%{ text-shadow: 0 0 4px #4cc134}  
    	}*/